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All Journal IJOG : Indonesian Journal on Geoscience Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Journal of Geoscience, Engineering, Environment, and Technology Jurnal Pariwisata Jurnal Pariwisata Terapan Jurnal Rekayasa Industri (JRI) Indonesian Journal on Geoscience Indonesian Journal on Geoscience Berita Sedimentologi

Mulyaningsih, Sri

Departement Of Geology, Faculty Of Mineral Technology, Institut Sains & Teknologi AKPRIND, DIYogyakarta, Indonesia

Author-ID : 775910

Humanities Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Physics Social Sciences Other

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Volcanostratigraphic Sequences of Kebo-Butak Formation at Bayat Geological Field Complex, Central Java Province and Yogyakarta Special Province, Indonesia Mulyaningsih, Sri
Indonesian Journal on Geoscience Vol 3, No 2 (2016)
Publisher : Geological Agency

DOI:10.17014/ijog.3.2.77-94Bayat Complex is usually used as a work field for students of geology and other geosciences. The study area is located in the southern part of the Bayat Complex. Administratively, it belongs to Central Java Province and Yogyakarta Special Province. The lithology of Bayat is very complex, composed of various kinds of igneous, sedimentary, metamorphic, and volcanic rocks. Most of previous researchers interpreted Bayat as a melange complex constructed within a subduction zone. Kebo-Butak is one of formations that forms the Bayat field complex. The formation is composed of basalt, layers of pumice, tuff, shale, and carbonaceous tuff. Most of them are known as volcanic rocks. These imply that volcanic activities are more probable to construct the geology of Bayat rather than the subducted melange complex. The geological mapping, supported by geomorphology, petrology, stratigraphy, and geological structures, had been conducted in a comprehensive manner using the deduction-induction method. The research encounters basalt, black pumice, tuff with basaltic glasses fragments, zeolite, argilic clay, as well as feldspathic- and pumice tuff. Petrographically, the basalt is composed of labradorite, olivine, clinopyroxene, and volcanic glass. Black pumice and tuff contain prismatic clinopyroxene, granular olivine, and volcanic glasses. Feldspathic tuff and pumice tuff are crystal vitric tuff due to more abundant feldspar, quartz, and amphibole than volcanic glass. Zeolite comprises chlorite and altered glasses as deep sea altered volcanic rocks. The geologic structure is very complex, the major structures are normal faults with pyrite in it. There were two deep submarine paleovolcanoes namely Tegalrejo and Baturagung. The first paleovolcano erupted effusively producing basaltic sequence, while the second one erupted explosively ejecting feldspathic-rich pyroclastic material. The two paleovolcanoes erupted simultaneously and repeatedly.

Geochemistry of Basaltic Merbabu Volcanic Rocks, Central Java, Indonesia Mulyaningsih, Sri; Shaban, Godang
Indonesian Journal on Geoscience Vol 7, No 2 (2020)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.7.2.161-178The studied area is located along the hiking track of Kajor - Selo, the south flank of Merbabu Volcano, Central Java, Indonesia. Olivine basalt and augite-rich basalt compose the volcanic rocks. A geochemical study recognizes these basalts which tend to originate from the product of tholeiitic magma, in terms of transitional enriched mantle source. It is interpreted to have been formed as primary magma that mixed later with higher degrees of partial melting with a mantle wedge. Both fl uid and melt were derived from the mixing of lower active continental margin and subducting oceanic slab. This study also shows general trends of increasing incompatible elements, i.e. Rb, Ba, Pb2+, and Sr as LIL trace elements and Th, U, Nb, Ce, Zr, Hf, Nb, and Ta as HFS element comparing to basaltic andesites exposed at Thekelan, they show decreasing compatible of MgO, Fe2O3*, Al2O3, CaO, TiO2, Ni, Sr, and Ba in line with increasing SiO2. It was fractional crystallization process, shown by the slightly wide variation of Rb/Zr and La/Sm that indicates random crustal contamination.

Earthquakes, Volcanic Eruptions, and Other Geological Disasters During Historical Records In Yogyakarta Special Region, Indonesia Mulyaningsih, Sri
Indonesian Journal on Geoscience Vol 8, No 2 (2021)
Publisher : Geological Agency

DOI:10.17014/ijog.8.2.197-212Yogyakarta, Indonesia, is a very fast developing area. The Yogyakarta historical time is divided into PreOld Mataram Era (1st - 8th century), Old Mataram Era (8th - 12th century), and Young Mataram Era (since 16th century). Geology has recorded many intermittent natural disasters within those historical time: volcanism, earthquakes, and rock movements as well. Those natural disasters have caused lots of damages, shown by buried and collapsed old buildings. Larger volcanic eruptions were known to occur once in 50 - 150 years ago, which were mostly followed by lahars as far as 32 km from the crater of Merapi Volcano, of which the last eruption was in 2010. Earthquakes were identified based on bumpy foundations that particularly occurred in the first pile of temple stones, i.e. at the temples of Kedulan, Plaosan, Morangan, Gampingan, and Boko Palace. Surface fractures are also present on the base of the palace floors. During 18th - 21st century, larger earthquakes with magnitude of 5 - 8 Richter scale occurred once in 20 - 70 years, of which the last earthquake was in 2006. A geological study clarified that there was a marine volcanism during the Tertiary with radial normal faults. The normal faults have been potential to reactivate since Plio-Pleistocene untill now, shown by surface deformations at Sudimoro Hills with a mass movement occurence as happened in Imogiri (March, 17th 2019), Pleret (2018), Piyungan, and Dlingo (March, 17th - 18th 2019). A stratigraphic study of volcaniclastic deposits around Gendol, Opak, Kuning, and Bedog Rivers shows potential floods around the rivers.

Co-Authors Abdul Faisal Baba Ari Kusnaedi Ariel l Afrandi Tatawu Bronto, Sutikno Bronto, Sutikno Deny Juanda Puradimaja Desi Kiswiranti Dina Tania Dina Tania Frando Ryan Alansa Godang Shaban Heriyadi, Nur Widi Astanto Agus Tri Hidayah, Radhitya Adzan I. Simon I. W. Prasetyanto Iva Mindayani Kusnaedi, Ari Mohamad Faizal Muchlis Muchlis Muhammad Nur Arifin Nur W.A.A.T. Heriyadi Prasetyanto, I. W. Puradimaja, Deny Juanda Rydo Faisal Arisandy Sampurno Sampurno Sampurno, Sampurno Shaban, Godang Shandi Hargian Wijaksono Simon, I. Suhartono - Suhartono Suhartono Suhartono Suhartono Suhartono Sutikno Bronto Sutikno Bronto Yahdi Zaim Yoyok Ragowo Siswomijoyo Sukisman Zaim, Yahdi

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Journal : Indonesian Journal on Geoscience